Here you'll find plenty of informations about various sensor-types and how to connect them to a midibox. If you're interested in working with sensors, you might also want to check out the ACSensorizer-Midibox project. The above picture is a DIY

Sensor-Wiki maintains a free list of possible sensors you could experiment with :

http://www.sensorwiki.org/doku.php/sensors/introduction

For example the picture above is a EEG Active Electrode from the OpenEEG Project. A mind-controlled midibox ? who said that ?

http://openeeg.sourceforge.net/doc/

• How to connect Non-10k Resistance-based Sensors: http://www.midibox.org/forum/index.php?topic=6506.0
• What's the issue about linearity? http://www.midibox.org/forum/index.php?topic=6728.0
• About Distance Sensors: http://www.midibox.org/forum/index.php?topic=5270.0
• About TouchPads, SoftPots and other interesting stuff: http://www.midibox.org/forum/index.php?topic=5023.0
• Touch Sensors (as Buttons): http://www.midibox.org/forum/index.php?topic=9220.0
• How to connect Flex-Sensors: http://www.midibox.org/forum/index.php?topic=5388.0
• Accelerometers, Tilt-Sensors: http://www.midibox.org/forum/index.php?topic=1985.0
• About Ribbon-Controllers: http://www.midibox.org/forum/index.php?topic=9679.0